Wings of Canon:Second Strike

Wings of Canon: Second Strike is SergioTurbo's second and last Protectors of the Plot Continuum spinoff. Set in 2034 HST and focusing on Keiko Turbo, Sergio Turbo and Nikki Cherryflower's daughter, it is only semicanonical as the setting is based on early plans of the cowriters' spinoffs that didn't come into fruition. However, according to SergioTurbo himself, the fanfictions featured were indeed missioned by Keiko, meaning that an hypotetical canonical version of those missions would only feature different people as Keiko's partners.

Second Strike currently features only three stories, one of which is set inside an old work by SergioTurbo himself. According to him, he had started writing a fourth story but stopped working on it after leaving the PPC community in 2017.

The first story was released in September 2016, and the third was released in December 2018, the latter being the last story SergioTurbo released before taking a hiatus from writing lasting around one year. Second Strike is only loosely a sequel to Wings of Canon: Blank Sprite, as it is only semicanonical and focuses on different characters, and likewise has The World Without Authors as a loose sequel of sorts as the incarnation of Keiko featuring in it is from around one year after the events of Second Strike, but The World Without Authors is itself its own continuity.

Youthful Indiscretion
Cowritten with Desdendelle, Youthful Indiscretion features his namesake agent training on the field Keiko, a young recruit. The missions is set in a badly written Mahou Shoujo Lyrical Nanoha alternate universe fanfiction in which Fate Testarossa is a vampire and Nanoha Takamachi's mother Momoko is an abusive and an alcoholic. As it is discovered that the vampiric version of Fate is a Character Replacement and the main Suvian, she is charged and killed by being dropped into a river, as rushing water is one of the ways to defeat a vampire. Keiko is quite surprised to discover that Desdendelle is actually a cyborg, but the latter is even more surprised when she turns out to be the daughter of two of his former colleagues.

The mission was originally framed in a way to completely hide Keiko's identity until the end on initial release, the announcement being made by Desdendelle and the note at the beginning only crediting SergioTurbo for Corolla, who appears as a DoSAT technician and is the one to recognize Keiko as Sergio and Nikki's daughter.

As canonically agent Desdendelle retired around 2017 HST, he is not the one who trained Keiko in the canon timeline, but it is unknown who would have taken his place instead.

Runs In The Family
Cowritten with Iximaz and with some contribution by Desdendelle, Runs In The Family is set soon after Youthful Indiscretion and features Keiko being temporarily partnered with Elanorelisindrivar, daughter of famed agent Aviator and, in this setting, Librarian. Their assignment is to take down the Author Wraith pretending to be both Bella Swan from Twilight and the daughter of Remus Lupin and Nimphadora Tonks from Harry Potter, causing an impossible crossover between the two series. Despite their inexperience, Keiko and Elanor successfully manage to dispel the Wraith and restore canon. Throughout their assignment, Keiko remains oblivious of Elanor being a Time Lord, only discovering it after the mission when she is picked up by her father, Librarian.

Elanor's introduction was altered afterwards, being canonically born four years earlier than what Runs In The Family claimed and being no longer Librarian's daughter, but having been conceived after Aviator got splashed with a pregnancy potion during a mission. As such, it is unclear whether in the canon timeline Keiko was partnered with the older, canonical version of Elanor, or if she had a different partner.

An Overabundance Of Turbochargers And Cherry Tree Flowers
Set sometime after Runs In The Family, An Overabundance Of Turbochargers And Cherry Tree Flowers has Keiko's new assignment being in Avalon: Last Rebel, a crossover story written by SergioTurbo himself and itself a recursive fanfiction of PyroMartino's own Avalon: Post Regnum, both stories written while Mai Dire Fine was ongoing. As the main target of the story is an alternate universe version of Keiko's father, she and Corolla enlist the help of Sergio and Nikki. Together, they not only manage to prevent the death of an alternate universe version of Nikki, but also manage to to talk down the alternate Sergio into surrendering. They both are recruited in the PPC, taking the names of Saki Cherryflower and Shiro Turbo respectively.

Trivia
According to SergioTurbo, this spinoff was inspired by other PPC authors writing stories featuring the future children of their agents, and some old Mai Dire Fine-era plans of having the appearance of Sergio and "Sakura"'s daughter from the future. Incidentally, Keiko would indeed appear with such a role later in The World Without Authors.